Compatible numbers can easily be divided mentally.
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Rational?
There is no such word since the ease of division depends on how well you know your times tables, how well you know your divisibility rules as well as how good you are at recognising patterns.
Your brain, of course.
It depends on your computational skills.
The answer depends on your skills and your knowledge of relationships between numbers. 76/95 might look hard but it is not if you recall (from your 19 times table) that 76/95 = (19*4)/(19*5) = 4/5 = 0.8.